ChromHMM is based on a multivariate hidden Markov model that models the observed combination ... We wrote the software in Java, which allows it to be run on virtually any computer.

C. Bracken, B. Rajagopalan, & E. Zagona (2014). “A Hidden Markov Model Combined with Climate Indices for Multi-decadal Streamflow Simulation,” Water Resources Research, 50, 7836-7846. Abstract: ...